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are very sensitive (Pandey , Pandey et al. 2015).Results and Discussion Total chlorophyll content (TCH )Results of measuring of chlorophyll contents indicated that the total chlorophyll content of the Morus alba was highest (site 4) in the selected sites. While Ailanthus altissima at site 1 had the lowest chlorophyll contents.In this study, total chlorophyll contents in three tree species studied were ranged between 2.52 to 7.10 mg.g-1 Fw.Chlorophyll is a photosynthetic pigment which indicate photosynthetic activity and dependent to factors such as age of plant species, environmental conditions, pollution level (Katiyar and Dubey, 2001; Ninave et al., 2001; Achakzai et al., 2017).Morus alba at polluted sites 4 and 3 (according to Tehran's air quality monitoring data) showed the highest chlorophyll content (7.1 and 6.4), while Salix babylonica, Ailanthus altissima at site 1 and 2 have the lowest chlorophyll content (3.26 and 52.2). According to capabilities of each tree, the response of three trees in sites 1 and 2 was less, but at sites 3 and 4 responded to air pollution by increasing the contents of Total chlorophyll. Therefore, all three trees have increased their chlorophyll content against air pollution, but the Morus alba tree has been more successful than other trees.The results of this study are consistent with the results of other researchers that plants with higher chlorophyll content are high resistant to air pollution (Shannigrahi et al., 2003; Prajapati and Tripathi, 2008; Rai and Panda, 2014.(Ascorbic acid Results of measuring of Ascorbic acid concentration indicated that Ascorbic acid concentration of the Morus alba was highest (site 4) in the selected sites. While Salix babylonica at site 2 had the lowest Ascorbic acid concentration. In this study , Ascorbic acid concentration in three tree species studied were ranged between 3.66 to 7.80 mg.g-1 Fw. Ascorbic acid levels in selected trees increase in contaminated areas(site 3,4). The results of this study are consistent with the results of other researchers, with high amount of stress, increase antioxidants such as ascorbic acid ((Mächler et al., 1995; Krishnaveni, 2013; Kaur and Nayyar, 2014).Relative Water Content (RWC)Results of measuring of Relative water contents indicated that Relative water contents of the Morus alba was highest (site 2) in the selected sites. While Ailanthus altissima at site4 had the lowest Relative water contents.In this study, Morus alba showed the highest RWC at site 3,4 , its value was even higher than the other trees. which is a sign of a better response of the Morus alba to contamination. The results are consistent with the results of other researchers(Ritchie et al., 1990; Chaves et al., 2003).pH leaf samplesResults of measuring of pH leaf samples indicated that pH leaf samples of the was highest (site 3) in the selected sites. While Ailanthus altissima at site2 had the lowest Relative water contents. In this study pH leaf samples in three tree species studied were ranged between4.9 to 7.4. Morus alba showed a better resistance than to the other tree species by trying to neutralize the alkaline pH. Ailanthus altissima and Salix babylonica, showed Acidic pH content (approximately 5.5).Air Pollution Tolerance Index (APTI) Results of measuring of APTI Values indicated that APTI Value of the Morus alba was highest (site 4) in the selected sites. While Salix babylonica at site4 had the lowest Relative water contents.According to the results of this study, White mulberry seem to be a good alternative to planting in Tehran and Tolerant to seasonal air pollution (summer and early autumn).In order to recommend the planting of this tree in different areas of Tehran, it is necessary to consider other criteria such as the water need for this tree, its transpiration rate, resistance to insects, such as aphids and whitefly. Also, its seedlings to test the maximum tolerance to air polluted in the appropriate greenhouses.]]>
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